Crown Audio IQ-MCA-IQ-MC8 - Manual (Page 16)

Page 16 Reference Manual
IQ-MC Modules
On/Off: Turns the limiter on or off.
Average Power Threshold: The
threshold is adjustable from 10 to
1000 watts.**
Nominal Load Impedance: The
nominal load impedance is settable
from 1 to 1000 ohms, and should be
set to correspond to the nominal
impedance rating of the load con-
nected to the respective channel.
Attack Time: Adjustable from 1 sec-
ond to 30 seconds in 1 second in-
crements.
Release Time: Adjustable from 1
second to 30 seconds in 1 second
increments.
4.5 Load Supervision
The Load Supervision feature al-
lows real time monitoring of the load
connected to each amplifier chan-
nel. When enabled, the IQ-MC con-
tinuously monitors the amplifier out-
put voltage and current and calcu-
lates the long-term average load
impedance. The measured load im-
pedance is compared against user
defined high and low limits. If either
limit is exceeded, the status indica-
tor and/or IQ System error reporting
functions alert the user of the prob-
lem. There are six controls and two
indicators for each channel:
On/Off: Turns the Load Supervision
feature on or off.
High Limit: Sets the upper bound
above which the system will report a
“high” error status.
Low Limit: Sets the lower bound
below which the system will report a
“low” error status.
Nominal Load Impedance: Sets the
expected average impedance for the
connected load. This value deter-
mines the output signal level required
for test. This parameter is also used
by the average power limiter to deter-
mine the expected power limit thresh-
old. See Section 4.4.3.
Calculate: This button invokes an
impedance calculator. Entering out-
put voltage and power will give the
expected impedance.
Include in Standard Error Report-
ing: Enables error reporting so that
any high/low status condition is re-
ported via the IQ System (See Sec-
tion 4.3.13).
Report to AUX: Enables any high/
low status condition to be reported
via the IQ-MC AUX port output (See
Section 4.1.5).
Test Indicator: This indicator lights
when the load supervision algorithm
is actually performing a load imped-
ance calculation and test verification.
Low/Normal/High Indicator: This
indicator shows the present status
of the load with respect to the user
defined high/low limits.
Z avg Monitor: Reports actual cal-
culated average load impedance.
** The average power threshold should be
set per the loudspeaker’s “long-term”
power rating (consult your speaker
documentation).